Printing telegraph apparatus



Dec. 5, 1939. H. L. KRUM Er Al. 2,182,635

PRINTING TELEGRAPH APARATUS FIG.2

FIG. 3

o 'ITORNEY.

CARL W. SWAN Dec. 5, 1939. H. 1 KRUM ET Al.,

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4 Sheets-Sheet 3 H. L. KRUM ET 'AL PRINTING TELEGRAPH APPARATUS FiledMay 6, 1937 Dec. 5, 1939.

INVENTOR.

A TORNEY.

Dec. 5, 1939. H. L. KRUM ET AL 2,182,635

PRINTING TELEGRAPH APPARATUS Filed May 6, 1957 4 Sheets-Sheet 4 2 FIG. 9

INVENTOR. HOWARD L. KRUM CARL W. SWAN ATTORNEY.

FIG.

Fatented Dec. 5, 1939 UNITED STATES PRINTING TELEGRAPH APPARATUS HowardL. Krum, Kenilworth, and Carl W. Swan, Chicago, Ill., assignors toTeletype Corporation, Chicago, Ill., a corporation o! DelawareApplication May 6, 1937, Serial No. 141,043

35 Claims. (Cl.1'7829) Ihe present invention relates to printingtelegraph apparatus and particularly to a type wheel printer forrecording characters in page form.

The principal object of the invention is to provide a page printer whichis light in weight and readily portable and at the same time reliableand emcient in operation.

An important object is to provide a type wheel printer in which thechief operating characteristics are analogous to those inherent incertain extensively employed type bar printers, to render the formerprinters capable of operation in the same telegraph circuits with thelatter printers for recording the same message in similar manner andperform the same functions.

Briefly, the apparatus according to the present invention employs asingle magnet permutation code selector, the selections on which aretransferred to a series of code bars, which selectively control aplurality of selectable drop bars or abutment members, which in turncooperate with a corresponding plurality of stop arms helically arrangedaround and aixed to a rotatable cylindrical member. Each of the stoparms terminates in two steps or shoulders, so that each arm governs thepositionment of two characters on a type wheel. The type wheel consistsof a circular disc, having equally spaced radial slots, thus forming aseries of radiating reeds, upon which the letters an and figures arearranged in a single row. The upper and lower case characters arearranged alternately, and mechanism is provided for shifting the typewheel angularly, or rotationally, relative to the axis of the supportingshaft, one-half a5 step, the distance between two successive charactersin the same case being considered as one step.

A cylindrical platen is movable to effect character spacing, is rotatedi'or line feeding, and is further controlled by character spacing andcaro riage return mechanisms. Visible printing is attained bywithdrawingthe type wheel from the platen, after printing, a substantial distancesufiicient to preclude obstruction of vision. The usual functions ofsuppressing spacing and printing during the performance of certain otherfunctions (for example, case shift, carriage return, and line feed) areincluded.

The functions are performed by levers actuated from cams on thevertically disposed main shaft,

.50 after being conditioned for operation by drop bars in the selectormechanism. Ink is supplied to the character faces on the type wheel bymeans of an inking roller` to simplify the construction, but it is, ofcourse, understood that ribbon feed and reversing mechanisms can readilybe applied. In connection with the carriage return mechanism, spacingand retaining pawls, when withdrawn from engagement with the spacingrack, are latched into drawn position and remain latched until thecarriage return operation is completed 5 and the next character isprinted, whereupon they Fig. 3 is a cross-sectional detail of thecode'bar 20 and selector member arrangement;

Fig. 4 is a side elevational view of the receiving apparatus accordingto the present invention;

Fig. 5 is an end view of the type wheel shaft with the type Wheel brokenaway to show the rela- 25 tive positions of the star Wheel and stoparms;

Fig. 6 is a fragmental perspective View of the anti-rebound device;

Fig. '1 is a top view of the receiving apparatus, with parts brokenaway, to illustrate various inter- )o nal mechanisms;

Fig. 8 is a fragmental plan view showing certain details not shown inFig. 7;

Fig. 9 is a front elevational view, with parts removed, of the apparatusaccording to the pres- $5 ent invention; and

Fig. 10 is a fragmental cross-sectional view `of the taut wirepape'rtearing edge.

The receiving apparatus according to the present invention comprisesessentially a printing unit 0 indicated generally by the numeral 2|mounted on a base portion indicated generally by the numeral 22. Apinion gear 23 is xed to the drive shaft 24 of a motor 25 and mesheswith a gear 28 carried on a vertically disposed main shaft 29 (Fig. 4).45 Shaft 29 has aixed thereto a collared member 3| and is supportedtherethrough by a supporting bracket 32. The shaft depends therefrom andis guided at its lower end by a bracket 33. Carried on shaft 29 is asleeve member 34 on which are 50 carried, as also indicated in Fig. 4, aspacing cam 35, a. transfer cam 36, and a printing .cam 31. Thefunctional mechanisms associated with these cams will be describedhereinafter. p

A toothed or grab clutch, indicated generally as u 38, is carried onshaft 29, and is superposed above vsleeve 34 and comprises a drivingportion 39 fixed to the shaft 29 and a driven portion 4| articulated bya tongue and groove connection 42 to the sleeve member 34. Drivenportion 4| of the clutch 38 is normally urged upwardly by a coil spring43, which movement is resisted by arm 44 of a release bail 45 pivotallycarried on a bracket 46 aixed to the printer frame 41. Arm 44 cooperateswith a cam portion 48 integral with the driven portion 4| of the clutch38. As the release bail is rocked in a manner presently described, thearm 44 thereof will be actuated outwardly (counterclockwise as viewed inFig. 1) out of engagement with cam portion 48, whereupon spring 43 willurge the driven portion 4| of clutch 38 upwardly into mesh with thedriving portion 39 which is constantly rotating. Then, after a singlerevolution has been completed, arm 44, which has been returned into itsposition against the clutch portion 4| by a spring 49 (Fig. 1), thecoaction between arm v4,4 and the cam portion 48 will cause thecammingout or disengagement of portion 4| from portion 39. Clutch 38 isreferred to as a single revolution clutch. Shaft 29 extends abovebearing 32land carries thereon a selector cam drum 5| and related/elements. However, disposed between the cam drum 5| and the bracket 32and aflixed to shaft 29 is a gear 52 which meshes with a gear 53 (Figs.1 and 8) frictionally carried on an auxiliary shaft 54.

Fixed to the upper end of shaft 29 is' a disc (Fig. 4). Cam drum 5| isfrictionally driven by shaft 29 through the instrumentality of frictiondiscs 56 and 51. Friction disc 56 is compressed between disc 80 and ange58 of cam drum 5|, and friction disc 51 is compressed between flange 59of cam drum 5| and a disc 6| by a helical spring 62. By this means, camdrum 5| will rotate with shaft 29 except when it is arrested by theengagement of stop lug 63 integral with cam drum 5| and-a stop gatel|54.

Stop gate 64 is mounted on a pivot stud 65 secured to an adjustableplate 66 (Figs. 4 and 1) and its upper arm 61 is adapted to be engagedby a. latch 68. The latch 68 is pivoted in a journal block 69, and thisjournal block is in turn mounted on the adjusting plate 66. Plate 66 maybe rotated about a pivot stud 1| by means of an orientation controldevice indicated generally by the numeral 12 and as described in PatentNo. 2,082,511, granted June 1, 1937. As shown in Fig. 4, both the latch68 and the stop gate 64 are carried on the adjusting plate 66 and aremovable therewith. By means of this orientation adjustment, the positionof arm 13 of stop gate 64 may be altered to obtain the best operatingconditions of the selector, as described in said patent. Associated withlatch 68 is a bell crank lever14 (Fig. 4) pivotally carried in a journalblock 15 mounted on plate 16 of the orientation device. Associatedwithvthe vertical arm of bell crank 14 and carried in block 15 is aplunger 11 which, as shown in Fig. 7, cooperates with arm 18 of aselector lever 19. Latch 68 is normally biased in a clockwise direction(as viewed in Fig. 4) by a coil spring 8| so that it is normally broughtinto locking relation with arm 61 of stop gate 64 and simultaneouslytherewith bell crank 14 is maintained in its counterclockwise positionand plunger 11 is in its retracted position. Thus when plunger 11 isdepressed or urged rightwardly, as viewed in Fig. 4, by the action ofselector lever 19 as will presently appear, bell crank 14 will be rockedclockwise and latch 68 will be rocked counterclockwise against theaction of its spring 8| to effect the release of the selector cam drum5| for rotation, which is effected by the pressure of stop lug 63against arm 13 of the stop gate 64, which pressure, owing to the releaseof latch 68 from arm 61, will cause the stop gate 64 to be rotatedagainst the action of its spring 82. When lug 63, in its rotation,escapes arm 13 of stop gate 64, the stop gate will be returned to itslocked position in engagement with latch 68 by the action of spring 82,so vthat when lug 63 again reaches arm 13, it

will be arrested thereby due to the detention of y arm 61 by latch 68.

Having reference now to Fig. 7, the details of the selector mechanismactuated by the cam drum 5| will be described. The selector cam drum 5|is rotated at a speed substantially equivalent to the speed of codeimpulsing, and operating in conjunction therewith is a selector magnet83 which may be connected either directly or indirectly (through a linerelay, for example) to the signal line. Selector magnet 83 is carried ona bracket 84 ailixed to the printer frame, and associated with theselector magnet 83 lis the selector lever 19 pivoted at 85.. Selectorlever 19 has a pole piece 86 which cooperates with the core 81 of theselector magnet 83, and is biased, upon deenergization of magnet 83, ina clockwise direction by a spring 88 distended between the pole piece 86and a spring anchor arm 89. Upon energization of selector magnet 83 bythe impression of marking current on the signal line, pole piece 88 willbe attracted, causing selector lever 19 to be actuated in acounterclockwise direction against the tension of spring 88.

Selector lever 19 terminates in a T-shaped portion 9| having downwardlyextending arms 92 (Fig. 4) which constitute abutments which cooperatewith arms 93 on the right ends (Fig. 7) of a series of selector ngers94. Selector fingers 94 comprise a series of thin, flat members arrangedin superposed relation between guide plates 95, and are equal in numberto the signaling elements of the code on which the receiving'printeroperates. Thus, if a five-unit code is employed, there will be five ofthe selector iingers 94, whereas a six-unit code will require sixselector fingers. The guide plates 95 are mounted on studs 96 secured tothe selector' mounting plate 91 (Fig. 4), and are spaced by washers (notshown). The circular right ends 98 -of selector ngers 94 engagecorresponding'sockets of thin fiat bell crank levers 99 pivoted on acommon shaft Individual springs |02 bias the bell cranks 99 in theirclockwise direction whereby the selector ngers 94 are urged leftwardly(Fig.,'1). The pointed ends |03 of bell crank levers 99 are thusmaintained in contact with the selector cam drum 5|.

As previously mentioned, selector cam drum 5| is provided with ahelically arranged series of cam projections 55 (Figs. 1 and 4), one foreach of the bell cranks 99, which function to rotate the bell cranks 99in succession and thusdraw the selector ngers 94 rightwardly (Fig. '1)successively as the selector cam drum 5| is rotated.

In addition to the longitudinal movement, the E against one or the otherof the abutments 92 of the T-shaped portion 9| of selectorlever 19. Asthe signal impulses are received over the telegraph line, the selectormagnet" 83 is energized and deenergized depending upon the nature ofsuch impulses, and as a result thereof, the abutments 92 are caused tocooperate with one or the other of the arms 93 to provide a fulcrumabout which the respective selector fingers 94 are rotated.

` Since in start-stop systems the normal stop condition of the line ismarking or current on the line, the selector magnet 83 will be normallyenergized and the selector lever 19 will be attracted and held in itscounterclockwise position. Upon the receipt of a start impulse, which isof spacing nature, the selector magnet 93 will become deenergized andthe spring 88 will bias selector lever 19 in a clockwise directioncausing arm 18 to depress plunger 1 1 to release latch 68 from stop gate64, thus permitting the selector cam drum 5I, through the release of itslu'g 63, to rotate, which rotation ensues during the reception of aseries of impulses constituting a signal. During the rotation ofselector cam drum 5I, the cam projections 55 successively cooperate withbell crank levers 99 causing them to rotate against the action of theirindividual springs |02 to bring the selector fingers 94 rightwardlytoward the U-shaped portion 9| of selector lever 19. At the instant ofreception of each code im? l pulse, a cam projection 55 coacts with abell crank 99 so that depending upon whether the code impulse is ofmarking or spacing nature, the selector lever 19 will assume either itsclockwise or counterclockwise position to permit `the abutment of one orthe other of the arms 93 on selector nger 94 with the correspondingdepending arm 92 on selector lever 19. Thus, upon the reception of amarking impulse, selector lever 19 will assume its counterclockwiseposition to cause the rocking of selector nger 94 to its clockwiseposition. On the other hand, if the received impulse is of spacingnature, selector magnet 83 will become deenergized and selector lever 19assumes its clockwise position whereupon selector nger 94 is caused torock to its counterclockwise position or the position shown in Fig. 7.

The left end of each of the selector iingers 94 cooperates with aT-lever |05 pivoted on a common shaft |06 and are likewise arrangedbetween guide plates 95. The reciprocation longitudinally of ngers 94 bybell cranks 99 under the influence of springs |02 will effect therocking of T-levers |05 to their clockwise or counterclockwise positiondepending upon whether ngers 94 are in their counterclockwise orclockwise position, respectively. T-levers |05 are pivotally articulatedto individual code bars II5, |20, and |2| of a series of code bars |01slidably mounted on studs |08 and |09. The series of code bars I 01 areset permutably in accordance with the received code combinationsofimpulses by the selector mechanism just described, and are retained intheir set position by the coaction of detent member III with detentnotches II2.

Cooperating with the series of code bars |01 are a plurality of selectordrop bars, or abutment members IIS (Fig. 2). In the present embodimentthere are eight members I I3, and associated with each member I|3 is acompanion labutment member I I4. The ends II 9 of arms IIB of selectormembers IIS and II4 provide abutments for a series of stop arms orprojections |00 and |22 helically arranged around and afxed to acylinder |25 (Fig. 1). Incidentally, each of the arms I I6 has avertically extending guide lug I I1 which cooperates with a guide comb|I8 (Fig. 7) Stop arms |00 and |22 terminate in a pair of steppedshoulders 230 and |24, one or the other of which strikes a selectedmember |I3 'or |I4, as will presently appear. Although the series ofcode bars |01 effect the selection of the selector members I I3 and/or`II4, three of the code bars IIS (Fig. 3), when operated permutably,eiect the selection of. one of the eight members |I3. The bottom codebar |20 of the series of code bars |01 is so arranged with its notchesas to permit or prevent the selection of the companion selector memberI4. The fth or top code bar |2| has its wards or projections only aboutone-half as high as the wards of the code bars II5 so that, comparedwith code bars |I5, code bar |2| may in eiect be deemed to have notchesof two dierent depths, one depth functioning to permit a predeterminedentrance of the selector member ||3 therein to coact with the stop arms|00 or |22 in a certain ,mannenand the deeper notches permitting afurther movement of the selector bars II3 to cause their coaction withthe stop arms in a diierent manner. As shown in Fig. 3, the selectormembers II3 cooperate only with the upper four code bars ||5 and |2|,and the companion selector member II4 cooperates only with the bottomcode bar |20. Each selector member I3 has a laterally disposed pin orstud |30 (Fig. 7) positioned in 'the path of rotation of the companionmember |I4, so that each selector member II3 can, under certainoperating condi tions, exercise control over its companion member |I4,as will be discussed presently.

Selector members II3 and II4 are normally biased in a clockwisedirection by springs |60 and |10, respectively, Figs. 2 and 9. Thus,when the middle three code bars ||5 are positioned in accordance withtheir corresponding code impulses of the code signal, an alignment ofnotches result to eiect the selection of one of the selector members I3.The amount of its clockwise rotation in response to the pull of itsspring is determined by the selective position of the top code bar |2|;f for example, the surface I|0 of one of the truncated wards of codebar |2| will permit the selector member II3 to -rotate only to such anextent that its end II 9 is presented into the path of the shoulder 230of a stop arm |00 or |22. If the top code bar. |2| is shifted so as topermit the movement of selector member II3 against the bottom |23 of adeep notch, further-rotation is permitted to selector member II3 so thatits end |I9 is presented into the path of shoulder |24 of its associatedstop arm |00 or |22.

With the permutations of the three middle code bars I|5, eightselections are possible. With the addition of the top code bar |2|, thenumber of selections is doubled, thereby permitting, with selectormembers II3, sixteen possible selections. Now, with the further additionof the bottom code bar` |20 and the response thereto of selector membersII4, the number of selections is increased or again doubled, givingthirty-two possible selections in the following manner: When the bottomcode bar |20 is in one of its longitudinal or selective positions, itslugs thereon act to block the clockwise movement of selector member II4,but when the bottom code bar |20 is moved to its alternate position, anotch ispresented to the vertical arm of the selector member I I4whereby, when the main. selector member I I3 is selected and permittedto rotate clockwise under the action of its spring |60, the selectormember ||4 associated with said selected member ||3 is permitted tofollow, in which case the actuated member I |4 is held against thelaterally disposed stud |30 by its spring, and in this manner the mainselector member 3 and its companion member ||4 move as a unit.

vThe shoulders 230 and |24 on each of the helically arranged arms and|22 are so positioned angularly (Fig. as `to correspond with the angularpositions of type facesl ona type Wheel |26 so that when one of theselector members ||3 and ||4 is moved into one ofthe paths of rotationof shoulders 230 and/or |24, the cylinder will be permitted to rotate ina counterclockwise direction until one of the stop arms |00 or |22 isarrested by the selected member ||3- or ||4. In this manner a characteron the type wheel is brought into printing position.

Referring to Figs. 4 and 9, the cylinder |25 which carries the stop arms|00 and |22, is

rotatably mounted on shaft 54 at the -left end of which (as viewed inFig. 4) is carried the type 'wheel 26. The left end. of the shaft 54 iscounterbored to receive a stub shaft |28 integral with the type wheelassembly and is provided with an open ended slot |29, which engages apin|3| integral with shaft |28. Shaft 54 is journaled in a bushing |32carried in a bracket |33 on the printer frame. Shaft 54 is alsosimilarly journaled in bracket |34. A constant torque is applied toshaft 54 through friction means |35 associated with a constantlyrotating gear 53, which meshes with gear 52 affixed to-the vertical mainshaft 29. The frictional connection between gear 53 and shaft 54 ismaintained by a coiled compression spring |38 (Fig. 8).

Rotation is imparted to cylinder |25 by the shaft 54 through theinstrumentality of a driving disc |39 affixed to shaft 54. Disc |39 hasa laterally disposed arm |4| which, through an interponent |42, coactswith an arm |43 integral with cylinder |25. Thus, when` cylinder |25 isfree to rotate by the removal of selector members ||3 and ||4 from thepaths of stop arms |22, rotational movement will be imparted thereto bythe shaft 54. Arms |4| and |43 are normally biased attrahentlyby aspring |40 coiled about shaft 54. Interponent |42 is integral with asleeve 245 slidably and rotatably carried on shaft 54, which Will befurther discussed in connection with the shift and unshift functions.

As previously described, there is mounted on the main shaft 29 (Fig. 4)a sleeve 34 which carries, among other cams, a vtransfer cam 36, whichcooperates with a follower roller |36 (Fig. 8) carried at the extremityof a transfer lever |44 (Figs. 1 and. 8) pivotally mounted on a verticalshaft |45. The forward end of transfer lever |44 is pivoted to one endof a link |46 (Fig. 1), the other end of which is pivoted to a dependingarm |41 of a transfer bail 48. Transfer bail |48 is rockably carried ona shaft |49 and is provided with a web portion |5| positioned beneathand spanning all of the selector members ||3 and H4.

Upon the reception of Va code signal, a start impulse thereof acts toinitiate the rotation of the selector cam drum 5| to eiect the selectivepositionment of the selector fingersl 94 as previously described.However, due to the locking action of the detent upon the code bars |01(Fig. 7), springs |02 of the selector levers 99 are unable to effect,through T-levers |05 (until at a predetermined instant), the shifting ofthe code bars |01 to a succeeding selection. Hence, through theinstrumentality of the transfer mechanism, this transfer of the settingof the selector fingers 94 to the code bars |01 is accomplished.Therefore, at a predetermined instant in the cycle of rotation of camdrum 5|, a cam projection |90 thereon acts upon an arm |52 of clutchrelease bail 45 to effect the disengagement of arm 44 from cam 48 ofthe' driven portion 4| of clutch 38, thus permittingvthe engagement ofportions 4| and 39l of the grab clutch 38 to effect the rotation of cams35, 36, and 31, of which cam 36 acts to effect the transfer operation.l

Upon rotation of cam 36, counterclockwise rotation is imparted to lever|44, which through link |46 (Fig. 1) rocks the transfer bail |43 in acounterclockwise direction which, through its web portion |5|, rocks allof the selector members ||3 and 4 counterclockwise bringing the verticalarms thereof out of engagement with code bars |01. Simultaneously,detent being controlled by the transfer bail |48 is lifted out oflocking engagement with the code bars |01, whereupon code bars |01 arefree to be reshifted to their newly selected position in response to theselective positionment of the several selector fingers 94. Afterpermitting sumcient time to e'ect the shifting of the code bars |01 intotheir new position, cam 36 permits the transfer bail 48 to be rocked toits clockwise position thus allowing selector members I3 and |4 to befree to respond to the pull of their respective springs |60 and |10 intoengagement with the series of code bars |01, as a result of which one ofthe selector members ||3 will find an alignment of notches, whereuponthe selected member ||3 will rotate clockwise a greater distance intothe path of its associated stop arm |00 or |22. A member ||3 isinvariably selected, the selection of its companion member ||4 beingeiected simultaneously with a member ||3 only when it is permitted to doso by the proper positioning of code bar |20; that is, when it isdesired to select a member ||3 only, its companion member ||4 is blockedagainst rotation under the action of its spring |10 by the code bar |20,and the pin carried by member ||3 will be moved free of the' companionmember ||4. On the other hand, when it is desired to select a member|14, the alignment of notches for its main member ||3 is made, and also,code bar |20 is shifted out of blocking engagement with member 4, andhence member |4 is permitted to bear against the pin |30 on itscompanion main member ||3 and follow said main member, thus effectingthe simultaneous selection of a pair of selector members ||3 and ||4.

Afiixed to the cylinder |25 is a star wheel |53, the teeth or points ofwhich have a definite relation, as will presently appear, with the stoparms |00 and |22, and hence the angular positions of the type faces uponthe type wheel |26. Cooperating with the teeth on the star wheel |53 isan intercepting arm |54 of a lever |55 (Fig. 1) which is pivotallycarried on shaft |49. Lever |55 is provided with a depending arm whichcoacts with an eccentric adjusting screw |56 mounted on arm |41 oftransfer bail |48. A spring |51 distended between an extension on link|46 and a lug integral with lever |55 tends to cause said depending armto bear constantly against the adjusting screw |56 and to cause lever|55 and transfer bail |48 to rotate as a unit. Thus, when transfer bail|48 is eil'ective during the performance of the transfer operation, aspreviously described, to rock selector members ||3 and I4 outof the pathof stop arms and |22, the cylinder |25 will not rotate or' spin freelybecause of the fact that intercepting arm |54 has been biased by spring|51 into the path of the oncoming tooth of the star wheel |53. Then whenthe transfer bailY |48 isreturned to its unoperated position,intercepting arm |54 is withdrawn from engagement with the tooth on thestar wheel |53 whereupon star wheel |53 and the cylinder |25 are free torotate until one of the stop arms |00 or |22 is arrested by theIimpingement of one of the shoulders 230 or |24 thereon against the end||8 of the selected member ||3 or ||4 to thus bring a type face on thtype wheel |26 into printing position.

Printing cam 31 (Figs. 1 and 4) cooperates with a follower roller |58carried on one arm of a printing control lever |59 pivotally mounted onthe vertical shaft |45. 'I'he lever |59, as shown in Fig. 8, is normallybiased in a ounterclockwise direction by a spring 250 to hold followerroller |58 against the periphery of cam 31. Lever |59 is pivotallyarticulated to the forked end of a link |6|, the other end of which ispivoted to a printing arm |62 pivotally m unted at |63 upon a bracket|64 integral with the printer frame 41 (Fig. 4). Distended betweenprinting arm |62 and frame 41 is a printing springk |65. Printing arm|62 terminates at its upper end with a striking surface |66 which actsupon the type wheel |26 to effect printing.

The type wheel |26 consists of a circular disc, having cut around thecircumference thereof equallyspaced radial slots |61 (Fig. 5) thusforming a series of radiating reeds |68 upon which letters and figuresare arranged in a single row. Adjacent the striking surface |66 is aV-shaped knife edge |50, which, as printing is being effected, projectsinto a notch in aperipherally notched corrector disc |80, to properlyalign and hold the type wheel in printing position in well-known manner.Printing arm |62 is provided, between the link |6| and the end |66, witha hook portion |69 which engages a ange |1| associated with type wheel|26. Type wheel |26 is provided, as previously mentioned, with a stubshaftl |28 which fits into the counterbored end of auxiliary shaft 54.In this manner, type wheel |26 is slidably or telescopcally articulatedto shaft 54 and by means of the inter-engagement of hook |69 and flange|1I, printing arm |62 is positively actuated, through link |6|, byprinting lever |59 to impart, in turn, movement to type wheel |26 afterprinting; the purpose of which is to permit visibility of a characterimmediately after it is printed. To achieve this result, type wheel |26is withdrawn from the printing platen |12 a sub-l stantial distance bymeans of the inter-engagemerit of hook |69 and flange |1|. Ink issupplied to the type wheel by an inking roller 80 carried on the end ofa resilient supporting bracket 90 which is secured to the frame 41.'Ihis arrangement permits the inking roller 80 to have contact with thetype wheel.|26 at all times during.

its reciprocative movement in the printing cycle.

Upon the initiation of the printing operation, the cam 31 is rotatedwhen the clutch arm 44 is released from shoulder 48 (Fig. 4)asvpreviously described. Follower roller |58 rides on a high portion ofcam 31 whereupon clockwise rotation is imparted sharply to printinglever |59 against the actionrof spring 250 to permit printing spring |65to act independently on the printing arm |62, due to the slottedinterconnection between lever` |59 and link I6|.`-. However,'the firstportion of the movement of printing arm |62 is employed, through theinstruriiem' tality of hook |69 and angef|1|g to bring the /t-ypef'wheel within printing rangeof theplaten |12, whereafter the furthermovement of printing arm |62 by spring |65 is utilized to present theend |66 thereof against a reed |68 of the type wheel |26, thus Lbringingthe type face thereon against the record material disposed in front ofthe platen |12. Cam 31 thereafter permits the printing lever |59 torotate counterclockwise under thev action of its spring 250, to effectleftward movement to link |6| to bring printing arm |62 to itscounterclockwise position and stretching spring |65 thereby storingenergy therein. This ismade possible due to the overpowering action ofspring 250 upon printing spring |65. At the same time, through hook |69and flange |1|, type wheel -|26 is withdrawn from l the platen to permitvisibility of the character last printed. To permit proper adjustmentbetween printing arm |62 and link |6|, printing arm |62 is provided withan enlarged hole to receive the shouldered clamping nut |13, and tofacilitate this means of adjustment, link |6| is provided with an openended slot |14 adapted to engage a guide pin mounted on printing so arm|62. v-

Platen |12 is carried in a carriage or frame indicated generally by thenumeral |16 (Figs. 4 and 7). Associated with platen |12 are pressure andguide rollers |11 which are of well-known construction and are not apart of the present invention. The platen carriage |16 is slidablymounted upon the. frame 41 of the printer through the medium of ballbearings |18 and |19. spacing rack |8| (Fig. 7), and cooperating withrack |8| is a spacing pawl |82 pivotally mounted on an arm |83 of `aplural arm lever |84. Pawl |82 is normally biased into engagement withrack |8| by a spring |81. Arm |85 of lever |84 carries a follower roller|86 which cooperates with the spacing cam previously mentioned. Thusupon rotation of cam 35, when arm 44 is disengaged from the drivenclutch member 4|, clockwise rotation is imparted to lever |84 causingpawl |82 to be actuated leftwardly, as viewed in Fig. 7, to move rack|8| one tooth and to move thereby'the platen carriage |16 one characterspace. To retain the platen carriage at the character space position towhich it. has been just moved, a detent pawl |88 is provided which alsocooperates with rack |8| and is spring biased thereagainst by a spring|89. Asthe platen carriage is actuated leftwardly, as viewedin Figs. 7and 9, it tends to wind up a carriage 1' e' turn spring 260 thus storingup energy to effect,l

upon receipt of the carriage return signal, the carriage returnoperation, the` carriage return spring being connected to the platencarriagein well-known manner.

Certain of the companion members ||4 control the function operations,such as carriage return, line feed, shift and unshift, and havedepending arms |92, 2|2, 221, and 228, respectively (Figs. 1, 2, and 9),which control the suppression of the printing and spacing operations. Asa function selector member ||4 is rocked 4clockwise by its spring |10,its dependingarm |92, 2|2, 221 or 228 acts on a bail portion |93.ofJaprinting and spacing cut-out lever |94 (Figs. 1 l and 9) to cause saidlever |94 to be rocked `clock- Mounted on the platen carriage |16 is a`wise. Lever |94 is normally biased in a counterclockwise direction by aspring 202.

Lever |94 has an arm |95 which extends in front of and blocks, undercertain operating conditions, a projection |86 (Figs. 1 and 4) integralwith link |8|, thus during the operation of a function wherein it isdesired to prevent the printing and spacing operations, arm |95 ispresented into the path of lug |96 so that when the printing spring |65tends to operate the printing arm |62, it is prevented from so doing bythe blocking action of lever arm |95 upon link |6|, thus cutting out theprinting operation when certain functions are performed. Simultaneouslytherewith, character spacing of the platen carriage |16 is prevented inthe following manner: Lever |94 is also provided with a curved arm |91(Fig. 2) to the terminal end of which is pivoted one end of a link |96,the other end of which is pivotally articulated to one arm of a bellcrank lever |99 ,(Fig. '1) pivotally mounted on the printer frame 41.The other arm of bell crank |199 carries a stud 20| engaging a slot inpawl |82. Accordingly, when Vthe printing and spacing cut-out lever |94is permitted to operate upon the selection of a function, not only willthe arm |95 thereon act to block the movement of link |6| and preventthe printing operation, but also, link |96 will be actuated rightwardly(as viewed in Fig. '7) to rock bell crank lever |99 clockwise to effectthe withdrawal of pawl |82 from rack |8|. Thus, when lever |64 operatesin a normal manner to perform the spacing operation, its action will benegatived by the prior withdrawalof pawl |82 from the rack |8|. When acarriage return code signal is. received to initiate .the carriagereturn operation, the code bars |01 are set permutably in responsethereto, thereby effecting the selection of the particular selectormember I|4 that is provided with depending arm |92, and that is alsoprovided with a projection 200 which acts upon an arm-203 (Figs. '1 and9) of a member 204 pivotally mounted on pins,or trunnions 205 and 206.Member 264 is also provided with vertically extending arms 201 and 208which engage pawls |88 and |82 respectively. Therefore, when thecarriage return selector member ||4 is actuated by its spring |10,member 204 is rocked inwardly (away from the reader as viewed in Figs.'1 and 9) by the action of projection 200 upon arm 203 to effect thewithdrawal of both pawls |86 and |82 from the rack |8| whereupon theplaten carriage |16 is free to respondto the pull of the carriage returnspring. Pawls |62 and |68 are held withdrawn from the rack |8| for theduration of the carriage return cycle, to insure the full return ofcarriage |16, by a latch 210 (Fig. '7) pivoted at 21| to the printerframe 41. Latch 210 is adapted, through the action of spring 212, toengage arm 201 of member 204, until it is disengaged by the impingementof a pin (not shown), carried on the bottom side of platen carriage |16,upon the end 213 of latch 210. To absorb the blow caused by the rapidreturn movement of the platen carriage |16 in response to the action ofthe carriage return spring, a dashpot, (not shown) is provided.

The line feed operation is controlled in a man ner similar to thecarriage return operation, by a particular selector member ||4 which isselected upon the receipt of a line feed code si'gnal. The line feedselector member ||4 has a depending arm y2|2 to the lower end of whichis pivoted one end of a link 2|3 (Figs. 1, 2, 4, and 9) case characters.

the other end of which is pivoted to an arm 2|4 (Figs. 1, '1, and 9)pivotally carried at the extremity of an arm 2|5 of thev plural armlever |84. Thus, when the line feed selector member ||4 is selected, itis permitted to rotate clockwise thereby drawing the link 2|3 leftwardly(Figs. 1 and 7) to bring the free end` of arm 2|4 into the path ofdepending arm 2| 6 `of a'line feed `lever 2|1 pivoted at 2|8 to theprinter frame 41. Then, when the plural arm lever |84 is actuated in aclockwise direction by the spacing cam 35, arm 2|4 is urged forwardly asviewed in Fig. '1, or leftwardly as viewed in Fig. 4, to rotate the linefeed lever 2|1 clockwise, which movement is effective, through a linefeed pawl 2|9 carried on the end of lever 2|1, to rotate the line feedratchet 22| a single angular step. As shownA in Fig. 4, the line feedratchet 22| is fixed to one end of a shaft 222, to the other endoffwhich is fixed a gear 223 which meshes with a long pinion 224 so thatgear 223 has slidable meshing engagement therewith. In this manner, gear223 is operatively connected with pinion 224 regardless of the characterspacing position of the platen carriage |16. Therefore, when the ratchet22| is rotated one angular step, this rotation is imparted through shaft222 and gear 223 to the pinion 224, and thence through idler gear 225 toa gear 226 fixedly associated to the platen |12. Simultaneously, withthe performance of the line feed function, the depending arm 2|2 alsoacts upon bail |93 to effect the suppression of the printing and spacingoperations in the manner previously described.

The shift and unshift mechanisms are controlled by the particularselector members ||4 having depending arms 221 and 226, respectively(Figs. 1 and 2). Pivotally connected to the depending arms 221 and 226are links 229 and 23|, respectively. Link 229 is pivoted to a latchmember 232, and link 23| is pivoted to a latch member 233, which latchmembers are pivoted by common pivot 234 to the end of an arm 235 of theplural arm lever |84 (Figs. 1, 2, '7, and 8). Each time that the pluralarm lever |84 is rocked by its `cam 35, latches 232 and 233 arereciprocated frontwardly and rearwardly of the apparatus. Latches 232and 233 terminate in their free ends with laterally disposed portions,which under certain predetermined conditions engage the ends of arms 236and 231, (Fig. 4) respectively. Arms 236 and 231 are pivoted at 238 and239 respectively, to a shift control lever 24| pivoted at 242 to theprinter frame 41. Lever 24| is provided with a vertical extension,carrying at its upper end a stud'243 (Fig. 1) which fits into a, groove244 Vin the periphery of a sleeve 245 slidably mounted on Athe shaft 54.Integral with sleeve 245 is the interponent |42 previously described,which is disposed between the two arms |4|4 and |43. Thus, when theshaft 54 rotates, the. arm |4| of disc |39 xed to shaft 54 impartsrotation not only through interponent |42 to the sleeve 245, but alsothrough interponent |42 and arm |43 tothe cylinder |25. Arms |4| and |43are normally biased attrahently by a common spring |40 (Figs. 4 and 8),and when the arms |4| and |43 assume the position closest to each other,the relationship between the stop arms |00 and |22 and the type wheel|26 is such as to print upper However, when the sleeve 245 is shiftedleftwardly, as-viewedin Fig. 4, or forwardly, as viewed in Figs. 1 and8, in a manner presently to be described, the interponent |42 will actupon the inclined cam surfaces 241 and 248 (Fig. 8) on arms |4| and |43,respectively, to spread said arms 4| and |43 apart against the action ofthe common spring |40, thereby changing the angular relationship betweenthe stop arms |00 and |22 on the cylinder |25 and the characters on`type wheel |26 one character position to print thereafter the charactersin the lower case position. The angular relationship between type wheel|26 and cylinder |25 is thus alterable because the type wheel isconstrained to move with shaft 54 (to which disc |39 is also fixed) andcylinder is freely mounted on said shaft. Therefore, it is manifest thatthrough thc medium of interponent |42 and cam surfaces 241 and 248, thearms |4| and |43 may be spread apart to change said angularrelationship, and upon retraction of interponent |42 and the concurrentaction ofspring |40, the original relationship will be restored.

To eect the shifting and unshifting operations, one or the other of thearms 221 or 228, respectively, is actuated upon the selectionof its'associated selector member |4 in response to the shift or unshift codecombinations, respectively. Upon the receipt of an unshift codecombination, the particular selector bar ||4 having the depending arm228 will be actuated ina clockwise direction which, through link 23|,will rotate latch 233 clockwise, as viewed in Fig. 1, to bring itslaterally disposed end into cooperative relation with the end of leverarm 231, whereafter upon the succeeding rocking movement of plural armlever |84 imparted to it by cam 35, the latch 233 will be actuatedrearwardly and in so doing will pick up the lever arm 231, which willthereby also be actuated rearwardly to impart counterclockwise rotation(as viewed in Figs. 1 and 4) to the shift control lever 24|. Thismovement of lever 24| will cause, through stud 243, the sleeve 245 to beshifted leftwardly whereby the vertical interponent |42 will act uponthe cam surfaces 241 and 248 to ,spread the arms |4| and |43,`respec4tively, thus changing the angular relationship 'between the stop arms|00 and |22 and the characters on type wheel |26 to print thereafterunshift or lower case characters, until a shift code combination issubsequently received.

When the shift code combination is received, the selector member ||4provided with the depending arm 221 is, upon selection, rocked clock-Wise to actuate the link 229 leftwardly to rotate arm 232 clockwise tobring its laterally disposed end into cooperative relation with arm 236whereafter, upon the ensuing 'rocking movement of plural arm lever |84,the arm 232 will be reciprocated; and upon the rearward movement in itslreciprocating cycle, arm 232 will pick up the lever arm 236 to imparttherethrough clockwise rotation to shift control lever 24 ,which throughstud 243 will shift the sleeve 245 rightwardly to retract interponent|42 from the cam surfaces 241 and 248, whereupon spring will again drawthe arms |4| and |43 together, thus bringing the stop arms |00 and 22and the characters on the type wheel |26 into that relation wherebyshift or upper case characters will thereafter be printed.Simultaneously with the performance of the shiftand unshift functions,the depending arms 221 and 228, respectively, also act upon bail i |93to effect the suppression of the printing and spacing operations asdescribed hereinbefore. The position of the shift mechanism as shown inthe drawings is such as to effect the printing of upper case characters.

The. type wheel employed in the apparatus according to the presentinvention is shown in Fig'. 5, and, as previously'mentioned, comprisesavr flat circular disc having'a seriesofradial slots |61 thereinfthuskproviding .a pluralityof radiating reeds |68 carrying,- adjacent theircircumferential ends,type faces252'; vThe lower case characters aredesignated by line 253,and`v the upper case characters are designated byline 254. It is thus noted that upper case and lower case charactersarearranged alternately. However, for the purpose ofthe presentdisclosure, the angular distance between successive lower casecharacters is deemed to be one step, land correspondingly the angulardistance between upper case characters is also deemed to be one step.Therefore, the distance between adjacent lower case and upper casecharacters is referredA to as one-half step; that is, when the angularrelationship between the characters on the type wheel and the stop arms|00 and |22 is such as to cause the printing of lower case characters,each shoulder on the ends of the stop arms |00 and |22 is effective withits associated selector member ||3 or 4, as the case may be, to positiona lower case character in to printing position. Then, when it is desiredto printA upper case characters, the relationship between stop arms |00and |22 and the selector members ||3 and ||4 is not changed, but thetype wheel is shifted angularly, by the aforedescribed shift mechanism,in relation to the st'op arms so that whenthe shoulders on-the stoparmsv coact with the selector members ||3 and/or ||4, an upper casecharacter will be presented to the printing position.

While the total number of permutations obtainable with five code bars isthirty-two, and with the shift and unshift possibilities, this totalnumber is doubled; namely, to sixty-four, the type WheelA |26 wouldnormally be provided with sixty-four angular positions which, in thepresent arrangement of characters, would leave eight more blank spacesthan are shown in Fig. 5, to allow for the performance of functions.However, with the apparatus according to the present invention,provision is made for suppressing the printing and spacing operationswhen functions are performed, thus making it possible to eliminate eightof the blank spaces, thus permitting the type wheel to be divided intoeight less divisions, having thereby fty-six equal divisions instead ofsixty-four, thus strengthening considerably the type wheel by making thereeds of greater width l It is seen that by the elimination of eightblank spaces, the teeth on the star wheel |53 have beendistributedto'provide an arrangement (asindicated in Fig.\5) wherebyonone side of the type wheel the teeth are arranged to span eightcharacters (as at |21),for each of four l tooth-spaces on the star wheel|53, while on the other side of the type wheel the teeth are spaced tospan six characters (as at 220) for each' of four tooth-spaces on thestar wheel, `two blank spaces having been eliminated for each of thelatter four Y tooth-spaces.

With the spacing of the teeth on star wheel |53 as indicated at |21, thestop arms |22 are arranged with their shoulders 230 and |24' spaced atregular angular intervals.v However, by eliminatingblank positions andthus reducing the numberof character positions on thetyp'e wheel,

it is possible to alter the position of certain ones The shoulders 230,then, of the arms |00 are thus advanced two angular spaces, to assumethe anguiar position thatwould otherwise'\'be'jassumed by its associatedshoulder |24. In other words, the two arms |22 embraced in space |30(Fig. 5)

comprise four stop positions and include three ofl the aforementionedfull steps; while the two arms and |22 embraced in the space |01comprise three stop positions and include two full steps.

A feature of the invention consists in providing a taut wire paper knifeassociated with the platen |12 as shown in Figs. 4, '1, and 10. Asillustrated in Figs. 4 and '1, a backing plate 2551s mounted in platencarriage |15 above the platen |12, and positioned in front of plate 255is a wire 255 which is provided with means for rendering it'taut forpaper carrying purposes. As shown in Fig. 10, wire 255 is folded back atits ends and is anchored in adjustable screws 251 and 250 carried in endplates 250 and respectively, of the platen carriage |15. 'Ihe desiredtautness of the wire 255 is established by turning the set screws 251and 250 sumciently, and lock nuts 252 and 253 are provided to maintainthe tautness. 'Ihe utility of a taut wire paper knife is emphasized bythe fact that it does not interfere with the lines of printing due tothe fact that it is of suiiicient narrowness to be readily confinedbetween the lines of printing.

A further feature of the invention consists in providing an anti-rebounddevice for preventing the cylinder 25 from rebounding after one of thestop arms |00 or |22 has impinged against a drop bar or abutment member||3 or ||4. A specific embodiment of this device is shown in Fig. 6 andcomprises a wheel 202 fixedly associated with cylinder |25 and providedaround its periphery with teeth 203 spaced to correspond withthe angularposltionment of shoulders |24 and 230 of stop arms |00 and |22.Cooperating with toothed wheel 202 is a pawl member 204 pivotallycarried at 205 on the frame 41 and spring biased normally intoengagement with the teeth 203 by a spring 205. The shape of teeth 203 issuch that the advancing edge of each tooth is inclined so as to cam outthe pawl member 204, and the trailing edge of each tooth .is radial withIrespect to wheel 202 so as to permit engagement thereof by the pawlmember 204. Thus when the wheel 202 rotates in a counterclockwisedirection (as viewed in Fig. 6) the teeth 203 act to cam the pawl member204 outwardly against the action of spring 205 until one of the arms |00or' |22 strikes a selected drop bar ||3 or ||4. Then, should thecylinder |25 tend to rebound ina clockwise direction, this action willbe prevented by the latching effect between pawl member 204 and anengaged tooth 203. opposite side of a tooth 2031 to revent rebound, whenthe rotating arm |00 or |22 is suddenly brought to a stop by engagementwith the selected drop bar ||3 or ||4.

General operation A complete description of the cycle of operationsinvolved in the printing of a character and also in the operation of afunction will be described. For example, it will be assumed that acharacteiT is to be printed, following which a function, such as shiftis to be performed.

That is, the pawl 204 engages with the character code signal has beenreceived, the clutch throwout lever 44 is tripped by operation of thelever |52 by the cam |00 of the cam'drum v 5| and the' clutch 30 becomesengaged, whereby rotation is imparted to the cams 35, 30, and 31. Almostimmediately after the cams begin to rotate, the cam operates itsfollower |35 (Fig. 7) which in turn, through lever |44, operatestransfer bail |40, whereby the character code combination in accordancewith the setting of the selector fingers 04, is permitted to betransferred to the code bars |01. As the operation of the transfer bailcauses the particular drop bar ||3 which had been selected previously tobe lifted out of the notches (and the detent to be lifted out of thenotches ||2) the code bars |01 are shifted to present a new alignment ofnotches, whereafter upon the return of the transfer bail |40 to itsformer position another one of the drop bars ||3 will follow into thenew alignment of notches.

Incidentally, while the transfer bail was thus operated to raise thedrop bars out of engagement with the code bars |01, thereupon liftingends I0 out of abutting relation with the' Istop arms |00 and |22, thecylinder |25 was prevented from spinning by the presentation of end |54of lever |55 into the path of the oncoming tooth of vstar wheel |53.Then, when the transfer bail |40 is returned to its clockwise position,end |54 is withdrawn from engagement with star wheel |53 to permit therotation of cylinder |25 until one of the shoulders 230 or |24 of stoparms |00 or |22 abuts the end ||0 of the newly selected drop bar ||3 or||4. Immediately after the type wheel |25 has been stopped under thecontrol of cylinder |25, the printing cam 31 acts upon follower rollertorotate lever |50 clockwise (Fig. 7) which permits the printing spring|55 to actuate the printing arm |52 clockwise (Fig. 4). g

As previously mentioned, type wheel |25 is so spaced from the platen |12as to provide visible printing. Therefore, the first portion of theclockwise movement of printing arm |52 is utilized (through hook |50 andhead |1|) to bring the type wheel |25 within printing range of theplaten, whereafter the remainder of the operative stroke of the printinglever |52 is employed in effecting, through end |55, the printingoperation.

In proper timed Arelation with the printing operation, and preferablyimmediately thereafter, the character spacing of the platen is performedthrough the instrumentality of spacing cam 35, which through itsfollower roller causes lever |05 to be rotated clockwise (Fig. 7)whereupon spacing pawl |02 is actuated leftwardly, to move, throughspacing rack |0|,-the platen carriage |15 leftwardly one characterspace.

Assuming that the next signal received is a shift code combination, theselector magnet 03 will respond to the impulses thereof to initiate therotation of the cam barrel 5| and to control the setting of the selector`lingers 04, in the manner previously described. At a timed instantduring the rotation of cam barrel 5|, the cam |00 thereon will, throughbail 45, effect the disengagement of clutch arm 44 andthe consequentinitiation of rotation of clutch 30. l operation of transfer bail |40through the instrumentality of transfer cam 35 the setting of the codebars |01 in accordance with the shift code combination is permitted.When the transfer bail isreturned to its normal position, the particulardrop bar I4 having the depending arm Upon the 221 is selected (that is,permitted to fall into alignment of notches) and under the action of itsspring |10 is permitted to rotate in a clockwise direction. Link 229 isthereupon actuated in a leftwardly direction to bring arm 232 intooperative relation with arm 236 so that when the plural arm lever |84(Fig. 7) is actuated in a clockwise manner by cam 35, latch member 232will be reciprocated rightwardly, as viewed in Fig. 4, and will engagearm 236 and impart thereto similar motion, causing the shift controllever 24| to be rocked in a clockwise direction which, through pin 243(Fig. l), will urge sleeve 245 to the right. permitting spring to movearms |4I and |43 closer to each other. In this manner, thetype wheel ispermitted to move one-half step in the normal direction of movement ofthe cylinder |25 to condition upper case characters for printing.

On the other hand, in response to an unshift code combination, thatparticular drop bar ||4 having depending arm 228 will be selected where-.by link 23| will be actuated leftwardly to bring `latch member 233 intooperative engagement with arm 231, so that upon the subsequentreciprocation of arm 233, lever 231 will be engaged and shift controllever 24| will be rocked counterclockwise causing, through pin 243,sleeve 245 to be moved leftwardly, whereby arm |42 will coact with camsurfaces 241 and 248 to spread arms |4| and |43 apart, against theaction of spring |40, suiliciently to change the angular relationshipbetween stop arms |22 and type wheel |26 onehalf step, therebyconditioning the lower case characters for printing.

The invention herein described may be embodied in other specific formswithout departing from the spirit or essential characteristics thereof.The present disclosure is therefore to be consideredV in all respects asillustrative and not restrictive, the scope of the invention beingindicated by the appended claims rather than by the foregoingdescription, and all changes which come within the meaning and range ofequivalency of the claims therefore intended to be embraced therein.

What is claimed is: y

1. In a printing telegraph receiver, a rotatable type wheel providedwith a plurality of characters, a member having a series of arms less innumber than the number of characters on said type wheel for controllingthe rotation thereof, a permutation selector mechanism, a plurality ofpairs of abuttable stop bars each pair comprising a main bar and acompanion bar cooperable with said arms for controlling said member,means whereby said main bars are selectable in two different manners bysaid selector mechanism under certain operating conditions to cooperatewith said arms, and means whereby said companion bars are selectableunder other operating conditions simultaneously with their main bar toexercise a prior control over said member.

2. In a selector, a rotatable shaft, arms having a plurality of abuttingsurfaces arranged around said shaft, a permutation code selectormechanism comprising a plurality of pairs of abutment members, and meanswhereby the members of said pairs of abutment members are selectablejointly or severally to exercise supervisory oontrol over said shaft. f

3. In a selector, a rotatable shaft arrestable in any one ofa pluralityof character positions. a cylinder carried by said shaft havingprojections thereon less in number than the available numberofvcharacterstcpping positions, abutment members correspondin'gfinnumberto the number of said projections, and means' forrenderlngfsaid membersoperable either singly or in pairs with said projections for determiningthe stop position or said shaft.

v 4. In a printing telegraph receiver, a character carryinginstrumentality, a rotatablev shaft therefor arrestable in any one of aplurality of character positions, a cylinderv carried bysaid shafthaving projections thereon less in number than the available number ofcharacter stopping positions, abutment members corresponding in numberto the number of said projections and cooperable with said projectionsfor determining the stop position of said shaft, and means facilitatedby the vcoincidence of certain of said abutments for reducing the numberof character positions on said instrumentality. n `5. In a printingtelegraph receiver, a character carrying instrumentality, a rotatableshaft therefor arrestable in any one of a plurality of characterpositions, a cylinder carried by said shaft having projections thereonless in number than the available number of character stoppingpositions, abutment members corresponding in number to the number ofsaid projections and cooperable with said projections for determiningthe stop position of said shaft, shift control mechanism, and shiftinstrumentalities carried on said shaft and controlled by said shiftcontrol mechanism to alter the operative relationship between saidabutments and said projections.

6. In a printing telegraph receiver, a type wheel, a rotatable shafttherefor arrestable in any, one of a plurality of character positions, acylinder carried by said shaft having projections thereon less in numberthan the available number of character stopping positions, abutmentmembers corresponding in number to the number'of said projectionscooperable with said projections for determining the stop position ofsaid shaft, certain of said abutment members provided with functioncontrolling instrumentalities, printing mechanism, and means forsuppressing the action of said printing mechanism when saidinstrumentalities are effective.

7. In a selector, a plurality of code bars, means controlled bysignaling impulses for positioning said code bars, a plurality ofselectable members, means for selecting certain of said selectablemembers through the positioning of certain of said code bars, and meanswhereby other of said selectable members are conditioned for selectionthrough the positioning of other code-bars simultaneously with theselection of'one of said plurality of selectable members.

8. In a selector, a member to be controlled, a plurality of code bars,means controlled by signaling impulses for positioning said code bars, aplurality of selectable members for controlling said member, means forselecting certain of said selectable members through the positioning ofcertain of said code bars, and means whereby other of said selectablemembers are conditioned for selection throughthe positioning of other ofsaid code bars to exercise a prior control over said member.

9. In a selector, a member to be plurality of code bars, meanscontrolled by signaling impulses forpositioning said code bars, aplurality of selectable members for controlling said member, means forselecting certain of said selectable members through the positioning, ofcertain of said code bars, and means whereby controlled, aI

other of said selectable members are conditioned for selection throughthe positioning of one of said code bars to exercise a prior controlover said member.

10. In a selector, a member to be controlled, a plurality of code bars,means controlled by signaling impulses for positioning said code bars, aplurality of selectable members for controlling said member, means forselecting certain of said selectable members through the positioning ofcertain of said code bars independently of the position of the remainingcode bars, and means whereby other of said selectable members controlledby both said plurality of selectable members and said remaining codebars to exercise a prior control over said members.

11. In a selector, a member to be controlled, a plurality of code bars,means controlled by signaling impulses for positioning said code bars, a

plurality of selectable members for controllingy said member, means forselecting certain of said selectable members through the positioning ofcertain of said code bars independently of the position of the remainingcode bars, and means whereby other of said selectable members areconditioned for selection through the positioning of said remaining codebars to exercise a prior control over said member.

12. In a printing telegraph receiver, a type wheel, a member forcontrolling the rotation thereof, arms having a plurality of abuttingsurfaces arranged around said member, a permutation code selectormechanism comprising selectable abutment members cooperable with saidsurfaces to determine the stop position of said member, cam meansassociated with said type wheel and said member, and means controlled bysaid selector mechanism to operate said cam means to alter the operativerelationship between said abutment members and` said' arms.

13. In a printing telegraph receiver, a character carryinginstrumentality, a member for controlling the rotation thereof, armshaving a plurality of abutting surfaces arranged around said member, apermutation code selector mechanism comprising selectable abutmentmembers cooperable with said surfaces to determine the stop position ofsaid member, a pair of cam members,

. a sleeve member, an element carried by said sleeve member andinterposed between said cam members, and means effective through saidsleeve member to control the positionment of said element with respectto said cam members to alter the operative relationship between saidabutment `members and said arms.

14. In a printing telegraph receiver, a character carryinginstrumentality, a rotatable shaft therefor arrestable in any one of aplurality of shaft having projections thereon less in number than theavailable number of character stopping positions, abutment memberscorresponding in number to the number of said projections and cooperablewith said projections for determining the stop position of said shaft, apair of cam members, a sleeve member, an element carried by said sleevemember and interposed between said cam members, and means effectivethrough said sleeve member to control the positionment of said elenntwith respect to said cam' members to alter the operative relationshipbetween said abutments and said projections.

15. In a printing telegraph receiver, a shaft constantly tending torotate, arms having a plurality of abutting surfaces arranged aroundsaid shaft, a permutation code selector mechanism comprising selectableabutment members cooperable with said surfaces to determine the stopposition of said shaft, means to prevent the spinning of said shaftduring the period of reselection of said abutment members, and means toprevent rebound of said shaft upon impingement of said surfaces againstsaid abutment members.

16. In a printing telegraph receiver, a shaft constantly tending torotate, arms having a plurality Vof abutting surfaces arranged aroundsaid shaft, a permutation code selector mechanism comprising selectableabutment members cooperable with said surfaces to determine the stopposition of vsaid shaft, and ratchet and pawl means to prevent reboundof said shaft upon impingement of said surfaces against said abutmentmembers.

17. In a printing telegraph receiver, a shaft constantly tending torotate, arms having a plurality of abutting surfaces arranged aroundsaid shaft, a permutation code selector mechanism comprising selectableabutment members cooperable with said surfaces to determine the stopposition of said shaft, means operable on said abutment members toenable the reselection thereof, a star wheel fixed to said shaft, meanscontrolled by said means and cooperable with said star wheel to preventthe spinning of said shaft during the period of reselection of saidabutment members, and means to prevent rebound of said shaft uponimpingement of said surfaces against said abutment members.

18. In a .printing telegraph receiver, a character carryinginstrumentality, a rotatable shaft therefor arrestable in any one of aplurality of character positions, a cylinder carried by said shafthaving projections thereon less in number than the available number ofcharacter stopping positions, abutment members corresponding in numberto the number of said projections cooperable with said projections fordetermining the stop position of said shaft, certain of said abutmentmembers provided with function controlling instrumentalities, printingmechanism, and means common to said certain abutment members andoperated thereby to suppress the action of said printing mechanism whensaid instrumentalities are effective.

19. In a printing telegraph receiver, a shaft constantly tending torotate, arms having a plurality of abutting surfaces arranged aroundsaid shaft, a permutation code selector mechanism comprising selectableabutment members cooperable with said surfaces to determine the stopposition of said shaft, a certain one of said abutment members providedwith function controlling instrumentalities, line feed mechanism, andpower driven means effective under the control of said certain one ofsaid abutment members to operate said line feed mechanism.

20. In a. printing telegraph receiver, a character carrying member, arotatable shaft therefor arrestable in any one' of a plurality ofcharacter positions, a cylinder carried by said shaft having projectionsthereon, abutment members cooperable with said projections fordetermining the stop position of said shaft, certain of said abutmentmembers provided with function controlling instrumentalities, a shiftcontrol sleeve, a shift control rocker lever articulated to said sleeve,a pair of shift control arms carried by said rocker lever, a pair ofreciprocating elements adapted to be brought into' operative relationselectively with said arms by said instrumentalities,

an element associated with said shaft, an element associated with saidcylinder, said elements having confronting cam surfaces, an interponentcooperable with said cam surfaces carried yby said sleeve, and powerdriven means to effectuatethe control of said instrumentalities to alterthe operative relationship between said abutments and said projections.

21. In a selector, a plurality of code bars, means controlled bysignaling impulses for positioning said code bars, a plurality ofselectable members, means for selecting certain of said members throughthe positioning of certain of said code bars, and means for selectingother of said selectable members through thepositioning of other codebars simultaneously with the selection of one of said certain of saidselectable members.

22. In a selector, a plurality of code bars, means controlledbyvsignaling impulses for positioning said code bars, a plurality ofselectable.

members, means for selecting certain of said members through thepositioning of certain of said code bars, and means whereby other ofsaid selectable members are conditioned for selection upon positioningof other of said code bars.

23. In a selector, a plurality of code bars, means controlled bysignaling impulses for positioning said code bars, a plurality ofselectable members, means for selecting certain of said members throughthe positioning of certain of said code bars, and means whereby other ofsaid selectable members are conditioned for selection upon thepositioning of one of said code bars. y

24. In a printing telegraph receiver, a character carryinginstrumentality, position determining means for determining thecharacter to be printed including a plurality of impact elements,

and means facilitated by the coincidence of certain of said impactelements for reducing the number of character positions on saidinstrumentality.

25. In a printing telegraph receiver, a character carryinginstrumentality, a rotatable shaft therefor arrestable in any one of aplurality of character positions, a cylinder carried by said shafthaving projections thereon provided with abutting surfaces, saidprojections less in number than the available number of characterstopping positions, abutment members corresponding in number to thenumber of said projections and cooperable with said abutting surfacesfor determining the stop position of said shaft, and means facilitatedby the coincidence of certain of said abutting surfaces for reducing thenumber of character positions on said instrumentality.

26. In a printing telegraph receiver, a character carryinginstrumentality, a rotatable shaft therefor arrestable in any one of aplurality of character positions, a cylinder carried by said shafthaving projections thereon less in number than the available number ofcharacter stopping positions, each of said projections provided with aplurality of steps, abutment members corresponding in number tothe'number of said projections and cooperable with said steps fordetermining the stop positionof said shaft, and means facilitated by thecoincidence of certain of said steps for reducing the number ofcharacter positions on said instrumentality.

27. In a printing telegraph receiver, a character carryinginstrumentality, a rotatable shaft therefor, means for arresting saidshaft in a plurality of character positions, said means comprisingabutment members and abutting members, shift control mechanism, andshift instrumentalities carried on '.saidshaft and controlled by saidshift control mechanism to alter the,l

operative relationship between said abutment members and said abuttingmembers.

28.` In a printing telegraph receiver, a character carryinginstrumentality, a rotatablel shaft therefor, means for arresting saidshaft in a plurality of character positions, said means comprisingabutment members and abutting members, shift control mechanism, andshift instrumentalities carried on said shaft and controlled by saidshift control mechanism to alter the `positional relationship betweensaid abutting members and said character carrying instrumentality.

29. In a printing telegraph receiver,l a shaft, a type wheel on saidshaft, means also on said shaft for determining its stop position forprinting from said type wheel, shift control mechanism, and shiftinstrumentalities carried on said shaft and controlled by said shiftcontrol mechanism to alter the positional relationship between saidmeans and said type wheel.

30. In a selector, a rotatable shaft, arms arranged around said shaft, aplurality of code bars mounted parallel and in juxtaposition to saidshaft, means responsive to signaling impulses for setting said codebars, a plurality of pairs of abutment members associated with said codebars and selective through the setting thereof and cooperating with said\arms, and means whereby the members of said pairs of abutment membersare selectable jointly or severally to exercise supervisory control oversaid shaft. i

31. In a selector, a rotatable shaft, arms arranged around said shaft, aplurality of code bars mounted parallel and in juxtaposition to saidshaft, means responsive to signaling im-fv pulses for setting said codebars, a plurality of pairs of abutment members, and means whereby themembers of said pairs of abutment members are selectable jointly andseverally to exercise supervisory control over said shaft.

32. In a printing telegraph receiver, a character carrying`instrumentality, a rotatable shaft therefor arrestable in any one of apluralityof character positions, a cylinder carried by said shaft havingprojections thereon, abutment members cooperable with said projectionsfor determining the stop position of said shaft, certain of saidabutment members provided with shift controlling elements, periodicallyoperated actu.- ators associated with said shift controlling elements, ashift control member, interponents carried by said shift control memberand cooperable with said actuators, and shift instrumentalities carriedon said shaft and controlled by said shift control member in response tothe effectiveness of said actuators upon said interponentsto alter theoperative relationship between said abutments and said projections.

33. In a printing telegraph receiver, a rotatable shaft, a type wheel,means rotatable on said shaft for determining its stop position forprinting from said-type wheel, shift control mechanism, and shiftcontrol instrumentalities carried on said shaft and controlled by saidshift control mechanism to alter, during rotation, the angularpositional relationship between said means and said type wheel. l

34. In a selector, a unidirectional means to be controlled, a pluralityof code bars, means controlled by signaling impulses for positioningsaid code bars, a plurality of selectable members for controlling saidunidirectional means, means for selecting certain Voi' said kselectablemembers through the positioning ot certain of said code bars. and meansfor selecting' other of said selectable members through the positioningoi other code bars simultaneously with the selection ot one oi' saidcertain of said selectable members4 to exercise a priorcontrol over saidmember.

35. In s. selector, a rotatable member to be conm trolled, arms arrangedaround said member, a

plurality oi' code bars mounted parallel and in HOWARD L. KRUM. CARL w.swAN.

